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Yes, everything was connected

turned out that it was bad u2890, after replasing with good one from same board it started to show in dfu mode now when i try to restore it shows me error (9)

Unfortunately I don’t have any history behind this machine Laptop is not going to DFU mode

Hello, i have 820-01598-A board that not powering on. usb-c tester shows that it takes 20v from original charger and going up to 600mA then drops to 430mA and stays . Basic voltages (at least the ones i mesured) are present, cpu is getting hot and missing some voltages ppbus_g3h - 12.62v...

I tried 2 more different SMC’s before from unknown models with same marking, but PPBUS was having wrong voltage with them (12.4 or something like that) but only with this one it’s getting its 12.6v. Unfortunately I don’t have same donor with SMC on it at the time

U7000 Pin 4 - 0.671 Pin 5 - 0.615 Is there any difference between SMC’s from same model but different revision of motherboard, even if marking is the same? Are they programmed differently?

u7000 SMC_BC_ACOK_VCC - 3.415 v ADAPTER_SENSE - 0.712 v SYS_ONEWIRE - 0.766 v u7001 SMC_BC_ACOK - 3.245 v SMC_BC_ACOK_VCC - 3.415 v PP3V42_G3H - 3.430 v SMC was taken from A1398 820-00138-A donor board SMC itself have same marking as original one Already tried nown good DCIN board, same result

Hi, I have 820-3787-A board that came to me with no power problem, it was blown u7190 and shorted u7100 that I replaced. After some troubleshooting I find out that something wrong my SMC and replaced it as well. Now machine is starting to work with around 1-1.5 A taking but only for 10-20...

Well it really was corrosion, found rossmans video about similar issues so I checked touchpad and it was corrosion on touchpad connector. Replaced connector and it’s working great now. In case someone needs link to video:

SMC_LID diode mode reading 0.745 SMC_LID voltage 3,4v Disconnected j9500 - same result

Hi, i have 820-00165 board that not starting from power button. The board works good when it starts from charger and since it started, it works even without charger, but it powering on only if i plug in cable. Power button is working fine, it can turn off machine but not turn it on.

Surrounding components and traces looks ok. I already suspected U5200 but replasing didn't give any result, only small chanches in ampmeter - 0.015-17A instead of 0.013-14

PPDCIN_AON_CHGR_R - 5.257v CHGR_AUX_DET - 0.863v CHGR_RST_IN - 0.035-0.038v PPCHGR_VDDA/P - 5.134v P3V8AON_PWR_EN - 0v CHGR_AUX_OK - 0v CHGR_AMON/BMON - 0v SMC_RST* shows as unconnected in my boardview

PPBUS_AON - 0.480 diode mode C5250 - 0.410v

Hi, I have 820-02100 board that not powering on. It shows 5v 0.013A on usb-c amp meter. It was liquid damage in UC260 area, and I have already found 2 shorts on pp5v_s2_main and fixed it but it didn’t help. I guess that now CD3217 is not speaking with U5200 so 20v is not boosting. PPBUS_AON -...

Hi, I have A2337 motherboard with shorted wi-fi chip. I know that this chips are not replaceable because they linked with cpu. Is there any way to change or fix it? Also I can’t find information about swapping m1 cpu on this machine's, do you know what chips are must be replaced with cpu from...

Maybe I am doing something wrong, you talk about getting board into DFU using Apple Configurator?

yes, they are stable

Same reaction

With battery connected tester shows pulsing between 5-448 mA PPBUS_AON still pulsing, but dropping to 9.9v instead of 0v